Reamer



(No Model.)

W. W. MOGREGORY. REAMER.

Patented Sept. 29,1891.

WITNESSES A TTORNE Y8 the same.

UNITED STATEs PATENT OFFICE.

. \VILLIAM YVHITNEY MCGREGORY, OF PASADENA, CALIFORNIA.

REAM ER.

SPECIFICATION forming part of Letters Patent No. 460,444, datedSeptember 29, 1891. Application filed November 11, 1890. Serial No.371,029. (No model.)

T0 atZZ whom it may concern:

Be it known that I, WILLIAM WHITNEY MCGREGORY, of Pasadena, in thecounty of Los Angeles and State of California, have invented a newandImproved Reamer, of which the following is a full, clear, and exactdescription. I

The invention relates to drilling-tools for boring wells, &c.; and itsobject is to provide a new and improved reamer which is simple anddurable in construction and readily expands to ream out the hole in theground or rock made by the drilling-tool to permit a convenient loweringof the well pipes or casing.

The invention consists of certain parts and details and combinations ofthe same, as will be hereinafter fully described, and then pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 is a sectionalside elevation-of Fig. 3 is a transverse section of the same, and Fig. 4is a sectional plan view of the same on the line w m of Fig. 2.

The improved reamer is provided with a head A, from which projectsupwardly a shank B, adapted to be secured to the drill-rod in a similarmanner as drilling-tools. From the lower end of the head A projectsdownwardly a tongue 0, terminating in a fork consisting of the arms D,arranged parallel with each other and each provided with an elongatedaperture D, through which passes a correspondingly-shaped boltE, adaptedto be locked in place by pins E. The bolt E passes through elongatedapertures F, formed in the lugs F, passing between the arms D of thefork. The lugs F are formed on the inside of the cutting-blades G ofsuitable length, the cutting-blades G having their lower ends pressedapart by springs H, preferably made in the shape shown in Figs. 1 and3that is, semi-ellipticaltheir backs resting one on the other. The upperends of the springs H are secured by pins or rivets to the cuttingbladesG. The upper ends of the cuttingblades G are provided with shouldersadapted to rest on the bottom sides of the head A.

The operation is as follows: When a hole has been bored in the ground orrock below the pipes or'casing already in the ground, the drilling-toolis removed from the drillrod and the reamer is secured to the same. Theoperator, in order to insert the reamer into the pipes, presses thelower ends of the cutting-blades G toward each other, so as to permitthe reamer to enter the pipes or casing. The drill-rods are then loweredin the usual manner, and when the reamer passes below the lower endofthe pipes or casing the springs H press the cutting-blades G outward,and the drill-rods, on being operated up and down, cause a consequentcutting by the cutting-blades in the ground or rock below the pipes orcasing. As the cutting-blades are expanded after leaving the lower endsof the pipes, the hole is reamed out, so that the pipes or casing canreadily be lowered by driving the same downward, as now practiced.

It will be seen that the cutting-blades are prevented from springingtogether at their free ends on account of the head A striking againstthe ends of the blades G, thus making the lower ends of thecutting-blades G rigid. The openings D in the arms D are made elongated,so as to allow the head A to strike against the ends of the blades G.

The openings in the lugs F are made sufficiently large to permit theblades G to spring together, so as'the reainer may be lowered in thewell and pulled out again.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The cornbinati0n,with the head, of the two opposedreaming-blades pivoted thereon and extending below the lower end of thehead, and a longitudinally-extending platespring secured on the innerside of each blade below the head and pivot and bowed inward intocontact with each other and holding the blades normally apart at theirlower ends, substantially as shown and described.

2. The combination, with the head A, having a central tongue 0,terminating in a fork D, the members of which are at right angles to thetongue and slotted longitudinally, of the reaming-blades G G, providedon their inner sides between their ends with longitudinally-extendinglugs F F, overlapping within the fork D and having registered openingsin line with the fork-slots, the pivot-bolt E, passing through saidslots and openings, and springs secured to the blades below theirlugsand pressing them apart, the inner faces of the upper ends of the bladesresting against opposite sides of the tongue C, the head A being adaptedto simultaneously engage the upper extremities of said blades,substantially as set forth.

3. The combination,with the head A, having a tongue 0 and a fork D, themembers of which are at right angles to the tongue, of the two bladeshearing at their upper ends on the opposite sides of the tongue and pr0-vided on their innerfaces between their ends with overlappinglongitudinally-extending lugs, and a flattened bolt or pivot connectingsaid lugs and having a sliding connection with the said fork to permitthe head to engage the upper extremities of the blades, and springspressing the lower ends of the blades apart, substantially as set forth.

WILLIAM WHITNEY MGGREGORY.

\Vitnesses W. G. MoGREeoRY, S. B. MCGREGORY.

